External browser sessions not working

I have it enabled in settings but whenever I try to change the display settings on any of my websites to "External" and press save, it does not save and it always reverts back to Embedded (tabbed). It always opens in the app's browser. I want it to open on Firefox.

Android app version 2026.2.2.3

Devices:
Pixel 8 android 17
Pixel 10 android 17
Pixel 4 android 13
Galaxy S25 android 15